TM 1637 is a common digital tube driver chip, which can drive monochrome or bicolor digital tubes. Support communication through serial port, simple operation and easy implementation.
TM 1640 is a digital tube driver chip with memory function, which can drive monochrome or bicolor digital tubes. Support communication through serial port or parallel port, with more functions, such as keyboard scanning and clock function.
Generally speaking, TM 1637 and TM 1640 have many similarities, but there are also differences, which cannot be directly replaced.